EP0991288A2 - Méthode et système pour le mise à jour des messages de service - Google Patents
Méthode et système pour le mise à jour des messages de service Download PDFInfo
- Publication number
- EP0991288A2 EP0991288A2 EP99307451A EP99307451A EP0991288A2 EP 0991288 A2 EP0991288 A2 EP 0991288A2 EP 99307451 A EP99307451 A EP 99307451A EP 99307451 A EP99307451 A EP 99307451A EP 0991288 A2 EP0991288 A2 EP 0991288A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- messages
- overhead
- message
- base station
- transmission
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
- H04W68/02—Arrangements for increasing efficiency of notification or paging channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
Definitions
- This invention relates to the field of wireless communications and more particularly to the field of overhead messaging in code division multiple access systems.
- a code division multiple access (CDMA) cellular telephone system uses spread spectrum technology to allow multiple users access to the same frequency band.
- CDMA code division multiple access
- the Telecommunication Industry Association and the Electronics Industry Association have adopted a standard, TIA/EIA IS-95 (IS-95), for digital cellular phone applications using CDMA techniques.
- IS-95 IS-95
- Such IS-95 systems are disclosed in detail in Garg, Smolik and Wilkes, Applications of CDMA In Wireless/Personal Communications, Prentice Hall, 1997.
- a CDMA system uses pseudorandom noise (PN) sequences to spread base station and mobile signals to the transmission bandwidth. Transmitted signals using different PN sequences can be received at the receiver, and the PN sequences allow the receiver to distinguish a desired signal from all the received signals.
- PN pseudorandom noise
- the geographic coverage provided by a CDMA cellular telephone system is divided into coverage cells, where each cell corresponds to a base station.
- the cell may be further divided for certain types of base stations into multiple sectors, where each sector uses multiple carrier channels.
- the parameters a mobile uses to establish and maintain a call are transmitted as a set of over the air (OTA) messages, known as overhead messages, by every base station in the network.
- OTA over the air
- the mobile determines if it has a current set of overhead messages before requesting traffic channel resources.
- the mobile monitors the paging channel to update the overhead messages. Once the mobile updates its overhead messages, it begins the access procedure. The likelihood of success of an origination attempt is related to the time taken to complete overhead message updates. The longer the process takes, the more likely the mobile is to leave the cell's coverage area, causing an access failure.
- This invention provides a method for reducing the time for a mobile to update overhead messages prior to making an access attempt, thereby improving the call origination success rate.
- the method takes advantage of time slots on the paging channel which are typically filled with a null message.
- a base station transmits a selected overhead message, in lieu of a null message. Because overhead messages are thereby transmitted more frequently, the mobile cycles through required messages and updates its parameters in a reduced time.
- the base station runs a timer to determine the paging channel slots that must contain an overhead message. In the intervening slots or slot fragments, the base station transmits mobile-directed messages, when they are available. When no mobile directed messages are available for transmission and the timer has not signaled that an overhead message must be sent, the base station selects an overhead message from a queue for transmission on the paging channel slot or slot fragment.
- a base station operating according to the method of the invention sends overhead message updates more frequently without consuming additional paging channel capacity, since the existing paging channel resources are used more efficiently.
- call processing for a mobile initiated call is divided into four states.
- the mobile seeks a suitable CDMA system (i.e. a serving base station), acquires a pilot channel, and obtains system configuration and timing information.
- a suitable CDMA system i.e. a serving base station
- acquires a pilot channel i.e. a pilot channel
- obtains system configuration and timing information i.e. a pilot channel
- the mobile completes this initialization, it enters an idle state where it begins monitoring the paging channel.
- a mobile In an IS-95 system, a mobile only monitors a paging channel associated with one base station and soft hand-offs are not applicable while the mobile is in the idle state.
- the mobile if it leaves a base station service area, may, however, execute idle handoffs, whereby it monitors a paging channel associated with a base station in the new service area. While monitoring the paging channel, the mobile receives overhead messages, including system parameter and access parameter messages. Before the mobile will attempt to access a base station, it monitors the paging channel until the access parameters have been updated. Additional call processing details can be found in Garg, Smolik and Wilkes, Applications of CDMA In Wireless/Personal Communications, Prentice Hall, 1997, p. 34 to p. 59.
- a paging channel message 200 has an 8 bit message length header 202, a message body 204, which is 2 bits to 1146 bits long, and a cyclic redundancy check 206 code of 30 bits.
- the padding 208 is not part of the paging channel message.
- a paging channel message is formed, it is typically sent in a paging channel half-frame, consisting of a synchronization bit and a chunk of data.
- Eight paging channel half-frames combine to form a paging channel slot 300, as shown in FIG. 2.
- An entire paging channel message is sent in N slots, and there are a finite number of slots a message can use.
- the paging channel carries a variety of messages, including system parameter messages, access parameter messages, order messages, channel assignment messages and the null message. All mobiles in an area receive the system parameter messages, which specify the characteristics of the serving system. Similarly, all mobiles receive the access parameters, which specify the parameters the mobile is to use when originating a call.
- Other overhead messages in an IS-95 system include neighbor list messages, CDMA access channel list messages, channel assignment messages, extended system parameter messages and global service redirection messages.
- mobile directed messages such as order messages
- a null paging message fills out unused slots and informs the mobile that no useful data is contained in the remainder of the slot.
- the base station fills unused paging channel slots with overhead messages required for base station access, such as access parameter messages.
- the base station selects an overhead message to fill available (otherwise unused) slots or slot fragments, resulting in near continuous transmission of overhead messages during periods of low traffic activity.
- FIG. 3 illustrates in a flow chart, the steps performed by a base station 400 to implement this method.
- a first decision step 402 determines whether the paging channel is scheduled to transmit overhead messages.
- a base station timer determines the timing for a minimum number of overhead messages which must be sent. If overhead messages are scheduled, an overhead message is selected 404 from a queue and transmitted 412 on the paging channel.
- a decision step 406 determines whether any mobile directed messages are available for transmission. If so, the base station selects the mobile directed message in a selection step 408 and transmits the message in a process step 412. In other words, mobile directed messages typically preempt overhead messages for other than the minimum required overhead messages.
- a base station 400 operating according to this method uses substantially all available time slots on the paging channel for information bearing messages.
- FIG. 4 one exemplary paging channel slot 500 according to this invention is shown.
- the slot 500 consists of eight half frames 502, 504, 506, 508, 510, 512, 514, 516.
- a base station operating according to the method of the invention transmits overhead messages according to a predetermined timing convention, as in the first half frame 502 of the paging slot 500.
- the next three half frames 504, 506, 508 the paging channel 500 carries mobile directed messages. Absent the method of the invention, however, the next four half frames 510, 512, 514, 516, which precede the next scheduled overhead message, would contain null messages, as no mobile directed messages are available. It is the advantage of this invention that the remaining half frames 510, 512, 514, 516 carry overhead messages instead of null messages.
- a base station operating according to this invention rarely, if ever, transmits a null message on the paging channel.
- a block diagram 600 of exemplary hardware for implementing the base station functions 400 of FIG. 3 is shown in FIG. 5.
- a programmable processor 604 controls the base station 400 paging channel function.
- the processor monitors a timer 602 which signals the processor 604 when the base station 400 must send overhead messages on the paging channel. Upon receipt of such a signal, the overhead message is selected from a queue 606.
- the processor 604 determines whether any mobile directed messages are available for transmission, and, if so, it directs the transmitter 608 to send the message.
- the mobile directed messages are stored in a memory 610. If none are available, the processor 604 selects an overhead message from the queue 606 for transmission.
- a CDMA system implementing the described invention will exhibit an improved overhead message update rate.
- the reduced time for a mobile to update overhead messages resulting from this invention will produce improved call origination success rates, without compromising paging channel capacity and without the need to modify existing mobiles.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US164399 | 1998-09-30 | ||
US09/164,399 US6374103B1 (en) | 1998-09-30 | 1998-09-30 | Method and system for overhead message updates |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0991288A2 true EP0991288A2 (fr) | 2000-04-05 |
EP0991288A3 EP0991288A3 (fr) | 2000-04-19 |
EP0991288B1 EP0991288B1 (fr) | 2005-11-16 |
Family
ID=22594311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99307451A Expired - Lifetime EP0991288B1 (fr) | 1998-09-30 | 1999-09-21 | Méthode et système pour le mise à jour des messages de service |
Country Status (9)
Country | Link |
---|---|
US (1) | US6374103B1 (fr) |
EP (1) | EP0991288B1 (fr) |
JP (1) | JP3600489B2 (fr) |
KR (1) | KR100461213B1 (fr) |
CN (1) | CN1250984A (fr) |
AU (1) | AU5010599A (fr) |
BR (1) | BR9904639A (fr) |
CA (1) | CA2280204A1 (fr) |
DE (1) | DE69928347T2 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008037142A1 (fr) * | 2006-09-29 | 2008-04-03 | Zte Corporation | Procédé de réduction de temps de réception d'informations de surdébit par un terminal de diffusion multimédia |
WO2013116739A1 (fr) * | 2012-02-03 | 2013-08-08 | Qualcomm Incorporated | Appareil et procédé pour réduire la charge d'un canal de radiomessagerie dans un réseau sans fil |
Families Citing this family (30)
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KR20000065358A (ko) * | 1999-04-02 | 2000-11-15 | 김영환 | 이동통신 시스템에서의 랜덤함수를 이용한 페이징 채널의 오버헤드 메시지 전송방법 |
CA2380015C (fr) * | 1999-07-22 | 2016-09-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Systeme et procede de communication des capacites de fonctionnement dans un reseau de telecommunications |
KR100344872B1 (ko) * | 1999-09-29 | 2002-07-19 | 엘지정보통신주식회사 | 휴대폰에서의 긴급 호 발신 방법 |
KR100861484B1 (ko) * | 2000-08-14 | 2008-10-02 | 콸콤 인코포레이티드 | 분산 제어에 의한 오버헤드 메시지 업데이트 |
US7330877B2 (en) * | 2000-09-18 | 2008-02-12 | Sharp Laboratories Of America | Devices, softwares and methods for rescheduling multi-party sessions upon premature termination of session |
US6990341B2 (en) * | 2000-12-30 | 2006-01-24 | Lg Electronics Inc. | Method for transmitting message in paging channel |
KR100860021B1 (ko) * | 2001-12-12 | 2008-09-25 | 엘지전자 주식회사 | 페이징 채널에서의 메시지 전송 방법 |
US9100457B2 (en) * | 2001-03-28 | 2015-08-04 | Qualcomm Incorporated | Method and apparatus for transmission framing in a wireless communication system |
US7349425B2 (en) * | 2001-03-28 | 2008-03-25 | Qualcomm Incorporated | Method and apparatus for overhead messaging in a wireless communication system |
US8121296B2 (en) * | 2001-03-28 | 2012-02-21 | Qualcomm Incorporated | Method and apparatus for security in a data processing system |
JP2004531937A (ja) * | 2001-03-28 | 2004-10-14 | クゥアルコム・インコーポレイテッド | 通信システムにおけるポイント・ツー・マルチポイントサービスのチャネル管理のための方法および装置 |
US8077679B2 (en) * | 2001-03-28 | 2011-12-13 | Qualcomm Incorporated | Method and apparatus for providing protocol options in a wireless communication system |
JP3695355B2 (ja) * | 2001-06-15 | 2005-09-14 | ソニー株式会社 | 携帯通信機器及びチャネル捕捉方法 |
US20040120527A1 (en) * | 2001-08-20 | 2004-06-24 | Hawkes Philip Michael | Method and apparatus for security in a data processing system |
US7185362B2 (en) * | 2001-08-20 | 2007-02-27 | Qualcomm, Incorporated | Method and apparatus for security in a data processing system |
US7697523B2 (en) * | 2001-10-03 | 2010-04-13 | Qualcomm Incorporated | Method and apparatus for data packet transport in a wireless communication system using an internet protocol |
US7352868B2 (en) | 2001-10-09 | 2008-04-01 | Philip Hawkes | Method and apparatus for security in a data processing system |
US7649829B2 (en) | 2001-10-12 | 2010-01-19 | Qualcomm Incorporated | Method and system for reduction of decoding complexity in a communication system |
US7599655B2 (en) | 2003-01-02 | 2009-10-06 | Qualcomm Incorporated | Method and apparatus for broadcast services in a communication system |
WO2004071114A1 (fr) * | 2003-02-06 | 2004-08-19 | Research In Motion Limited | Appareil et procede associe destines a radiodiffuser des codes courts en vue de diriger un appel vers un centre de service pendant le fonctionnement d'un systeme de communication mobile |
US8098818B2 (en) | 2003-07-07 | 2012-01-17 | Qualcomm Incorporated | Secure registration for a multicast-broadcast-multimedia system (MBMS) |
US8718279B2 (en) | 2003-07-08 | 2014-05-06 | Qualcomm Incorporated | Apparatus and method for a secure broadcast system |
US8724803B2 (en) | 2003-09-02 | 2014-05-13 | Qualcomm Incorporated | Method and apparatus for providing authenticated challenges for broadcast-multicast communications in a communication system |
KR100606026B1 (ko) * | 2004-02-23 | 2006-07-26 | 삼성전자주식회사 | 이동 통신 단말기의 전력을 절감하는 이동 통신 시스템 및그 방법 |
KR100581834B1 (ko) * | 2004-02-23 | 2006-05-23 | 주식회사 팬택앤큐리텔 | 이동통신 단말기의 통신 방향 제어시스템 및 방법 |
CN101768289B (zh) * | 2009-01-04 | 2012-08-22 | 吕大龙 | 石粉塑料塑化剂及生产方法 |
US8340055B1 (en) | 2010-07-16 | 2012-12-25 | Sprint Spectrum L.P. | Prioritization of final page attempt to mobile station |
US8842643B1 (en) * | 2010-07-16 | 2014-09-23 | Sprint Spectrum L.P. | Dynamic adjustment of the maximum period between overhead-message transmissions on a paging channel |
US8811279B1 (en) * | 2011-02-11 | 2014-08-19 | Sprint Communications Company L.P. | Overhead message prioritization based on rate of originations |
US9439225B2 (en) * | 2012-08-23 | 2016-09-06 | Qualcomm Incorporated | Rapid network acquisition and overhead message storage for machine-to-machine devices |
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US4527284A (en) * | 1982-01-14 | 1985-07-02 | Siemens Aktiengesellschaft | Adjacent radio cells paging channel chaining system |
EP0415502A2 (fr) * | 1989-09-01 | 1991-03-06 | Philips Electronics Uk Limited | Système de communications |
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EP0930798A2 (fr) * | 1998-01-05 | 1999-07-21 | Nokia Mobile Phones Ltd. | Utilisation d'un canal de d'appel pour diffusion d'informations cellulaires |
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US5701592A (en) * | 1994-12-19 | 1997-12-23 | Telefonaktiebolaget Lm Ericsson | Method and system for desynchronizing overhead messages in a radiocommunication system |
US6018661A (en) * | 1995-10-18 | 2000-01-25 | Telefonaktiebolaget Lm Ericsson | Inhibiting and controlling signal strength measurements by a mobile station in a wireless communication system |
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1998
- 1998-09-30 US US09/164,399 patent/US6374103B1/en not_active Expired - Lifetime
-
1999
- 1999-08-10 CA CA002280204A patent/CA2280204A1/fr not_active Abandoned
- 1999-09-20 BR BR9904639-3A patent/BR9904639A/pt not_active Application Discontinuation
- 1999-09-21 EP EP99307451A patent/EP0991288B1/fr not_active Expired - Lifetime
- 1999-09-21 DE DE69928347T patent/DE69928347T2/de not_active Expired - Lifetime
- 1999-09-23 AU AU50105/99A patent/AU5010599A/en not_active Abandoned
- 1999-09-29 CN CN99120554A patent/CN1250984A/zh active Pending
- 1999-09-30 KR KR10-1999-0041961A patent/KR100461213B1/ko not_active IP Right Cessation
- 1999-09-30 JP JP27790599A patent/JP3600489B2/ja not_active Expired - Fee Related
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008037142A1 (fr) * | 2006-09-29 | 2008-04-03 | Zte Corporation | Procédé de réduction de temps de réception d'informations de surdébit par un terminal de diffusion multimédia |
US8233421B2 (en) | 2006-09-29 | 2012-07-31 | Zte Corporation | Method for reducing times of receiving overhead information by mobile multimedia broadcast terminal |
WO2013116739A1 (fr) * | 2012-02-03 | 2013-08-08 | Qualcomm Incorporated | Appareil et procédé pour réduire la charge d'un canal de radiomessagerie dans un réseau sans fil |
Also Published As
Publication number | Publication date |
---|---|
EP0991288B1 (fr) | 2005-11-16 |
EP0991288A3 (fr) | 2000-04-19 |
US6374103B1 (en) | 2002-04-16 |
KR20000034958A (ko) | 2000-06-26 |
DE69928347T2 (de) | 2006-07-27 |
KR100461213B1 (ko) | 2004-12-14 |
JP3600489B2 (ja) | 2004-12-15 |
CA2280204A1 (fr) | 2000-03-30 |
BR9904639A (pt) | 2000-09-05 |
AU5010599A (en) | 2000-04-06 |
DE69928347D1 (de) | 2005-12-22 |
CN1250984A (zh) | 2000-04-19 |
JP2000115860A (ja) | 2000-04-21 |
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